# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2014-09-18 02:57:09
# Node ID faf4f63533ff3d66544905dea1d9668ce1388dcb
# Parent  5c53d7888aef31f7a5159b4fbcc1bbcbcf1ecbdd

revset: use `subset &` in `bookmark`

Speedup, Weeeeeee!

revset #0: bookmark()
0) wall 0.002240 comb 0.000000 user 0.000000 sys 0.000000 (best of 571)
1) wall 0.000132 comb 0.000000 user 0.000000 sys 0.000000 (best of 14059)

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -468,7 +468,7 @@ def bookmark(repo, subset, x):
         bms = set([repo[r].rev()
                    for r in repo._bookmarks.values()])
     bms -= set([node.nullrev])
-    return subset.filter(bms.__contains__)
+    return subset & bms
 
 def branch(repo, subset, x):
     """``branch(string or set)``